1. Advanced Java Programming
Session #, Speaker Name
Advanced Java Programming
CSS446
Spring 2014
Nan Wang
08/24/11

2. Chapter Goals To learn how to discover new classes and methods
To use CRC cards for class discovery
To identify inheritance, aggregation, and dependency relationships between classes
To describe class relationships using UML class diagrams
To apply object-oriented design techniques to building complex programs

3. Discovering Classes
Requirements specification: a description of what your program should do.
To discover classes, look for nouns in the problem description.
Concepts from the problem domain are good candidates for classes.

4. Print an invoice
Invoice
Customer
LineItem

5. CRC Card Method
A simple rule for finding these methods is to look for verbs in the task description.
CRC card describes a class, its responsibilities, and its collaborating classes.
C: Classes;R: Responsibilites;C: Collaborators

6. Relationships Between Classes
Dependency
Aggregation
Inheritance

7. Dependency
A class depends on another class if it uses objects of that class.
It is a good practice to minimize the coupling (i.e., dependency) between classes.

8. Aggregation
Aggregation relationship is informally known as the “has-a” relationship.
The aggregation relationship states that objects of one class contain objects of another class.
Aggregation is a stronger form of dependency

9. Aggregation
A car has a motor and tires. In object- oriented design, this “has-a” relationship is called aggregation.

10. Inheritance
Inheritance is a relationship between a more general class (the superclass) and a more specialized class (the subclass).
This relationship is often described as the “is-a” relationship.

11. Attributes and Methods in UML

12. Multiplicities • any number (zero or more):­* • one or more:­1..*
• zero or one:­0..1
• exactly one:­1

13. Five-part program development process
1. Gather requirements.
2. Use CRC cards to find classes, responsibilities, and collaborators.
3. Use UML diagrams to record class relationships.
4. Use javadoc to document method behavior.
5. Implement your program.

20. Challenging Project – 150 points

21. Benchmark Project – 100 points

22. Programming Assignment
Due date: Feb 27
Midterm March 3:
No Class on March 6 (Conference)